Starting-rheostat.



PATENTED SEPT. 6, 1904. F. MAGKINTOSH.

STARTING RHEOSTAT.

APPLICATION FILED JULY ze. 1901.

Amay.

No. 769,6'19. Patented September 6, 1904.

UNTTED STATES PATENT Ormea,

FREDERICK MACKINTOSH, OF SCHENECTADY, NEr YORK, ASSIG'NOR TO GENERAL ELECTRIC (VOMPANY, A CORPORATION OF NElV YORK.

STARTING-RHEOSTAT.

SPECIFICATION forming part of Letters Patent No, 769,619, dated September 6, 1904. Application filed July 2G, 190].. Serial No. 69,807. (No model.)

T ZZ 107mm/ 1W/If WWW/"bf a diagrammaticrepresentation of a pump-ac- 5o Beitknown that LFREDERiCk MaokiN'rosH, i cumulator, pump-motor, rheostat, and the vaa citizen of the United States, residing at rious circuits and switches above referred to.

Schenectady, county of Schenectady, State of l Fig. 2 shows the spring in the rheostat switch- 5 NewYork, have invented certain new and usei arm. Fig. 23 illustrates the relative positions ful Improvements in Starting-Rheostats, lof of the switch-arm and the electromag'netic 55 which the following' is a specilication. i clutch.

This invention relates to electric motorsgand 1 .ln Fig. l the pump A is driven by the elecits object is to provide improved means for tric motor B, and its delivery-pipe f/v is con- Io automatically starting and stopping' a 'motorl ncctcd with an accumulator C, provided with driven pump without danger of burning the the usual weighted plunger c. The field-coils 6o rheostat-contacts. l of the pump-motor B are energized by cui The invention consists in a rheostat whose i rent led through branch conductors from the switch-arm is normally held in the otl' posimains l Q, preferably through an automatic I 5 tion by a coiled spring. rhen the motor is circuit-ln'eaker D and double-pole switch E,

to be started, an electromagnetic clutch concontrolling the branch conductors 3 4L. An 65 nects the arm to a smalldriving motor for the electromagnetic switch F is connected across rheostat, whereby the arm will be swept over the conductors 3 et through a float-switch G, the rheostat-points until the pump-motor rewhose lever ,f/ is controlled by the up and 2O ceives full-line voltage, at which point the arm down movements of the accumulator-plunger,

opens a supplemental switch in the armaturepreferably by arranging an endless belt H circuit of the rheostat-motor, which at once adjacent to said plunger, with tappets z/ to be stops,and theswitch-arm then remains stationi struck by the plunger near the ends of its ary, being held by the electromagnetic clutch. stroke, whereby the belt will be moved, and

2 5 An accumulator is connected with the pump, buttons /i thereon will actuate the switch-arm and its plunger controls a switch by means of y, closing the switch Cr on the downstroke of which the circuits of the rheostat-motor, the the plunger and opening it on the upstroke. electromagnetic clutch, and the armature of The electromagnetic switch F is preferably the pump-motor are controlled, preferably such a one as is shown in the application of 3o through an intermediate electromagnetic i F. E. Case, tiled February 28, 1898, Serial switch. 'hen the accumulator is full, the i! No. 671,99l. It controls a conductor, which SO switch opens these circuits and the pump-motakes current from the conductor 3 and leads tor stops. At the same time the rhcostat to one brush of the pump-motorB. rlheother switch-arm is released by the denergizing of brush is connected by wire (5 with a contactr 3 5 the clutch and the spring returns said arm to segment i of the starting-rheostat l. ln the ofi' position. On its way the arm closes the same circle as this segmentare the several con- 8 5 supplementary switch in thearmature-circuit tact-points and a segment f2. Concentric of the small motor, and thus puts said motor with these is a long segment i, connected by in readiness to start when the accumulator wire T with the conductor l. A switch-arm 4o throws back its switch. The rheostat-arm l is pivoted concentric with these segments therefore does not go to the ott position unand carries a ln'idging-contact u, serving to 90 til after the pump-motor circuit is broken, so i connect the segment i with those in the other that there is no arcing' at the rheostat-concircle. A spring' K, preferably coiled in the arm in the olf position, (indicated by dotted lines.)

In order to swing' the rheostat-arm l over the points i", and thus cut out the resistance from the circuit of the pump-motor and start Y 45 jured. Vhatever arcing' takes place on breaky ing the pump-motor circuit is restricted to the electromagnetic switch, where it can be properly cared for.

ln the accompanying'drawings, Figure lis l tacts, and they are thus kept from being' inhub of thel switch-arm l', tends to keep the l l l the same, the arm carries one part of an electromagnetic clutch L, whose other part is secured to a shaft on which is a worm-gear M, engaged by a worm N on a shaft O, which is rotatable by a small electric motor P. The coil Z of the clutch is permanently connected by wires 8 with the conductors 5 A, so that it is controlled by the electromagnetic switch F. The field-coil of the rheostat-motor P is permanently connected by wires 9 with the conductors 3 4, so that it is constantly energized. A wire l0 connects the conductor 5 with the stationary contact ot' a switch R, whose movable arm is connected with one armature-brush of the rheostat-motor P. The other brush is connected by wire ll with the other side of the circuit. On the rheostat-arm I' is a pin vf", which moves the arm of the switch R, opening it as the arm I' reaches full on position and closing itias it starts back to off position.

The operation of my invention is as follows: Suppose the parts to be in the position shown in Fig. l, with the pump-motor running at full speed and the plunger of the accumulator slowly rising. The rheostat-motor is not running, its armature-circuit being open at the switch R. The rheostat-arm is held in its full on position by the clutch, which is energized through its leads 8. The switches F G are closed. Now when the plunger rises high enough to strike the upper tappet the belt is moved along, pulling' down the lever of the iioat-switch and opening the circuit of the electromagnetic switch, which in turn breaks the circuit through the conductor 5. This opencircuits the pump-motor armature and denergizes the electromagnetic clutch, releasing the rheostat-arm, whose spring at once throws it around to off position, and in so doing it closes the switch R in the rheostat-motor circuit.

When the accumulator-plunger sinks low enough to move the belt in the opposite direction, the switch G is closed, thereby closing the switch F, which results in energizing the clutch, starting the rheostat-motor, and sendingcurrent through the pump-motor with increasing voltage as the motor P turns the rheostat-arm over the resistance-points until said motor is stopped bythe arm I opening the switch R. The parts have then arrived again at the position shown in Fig. l.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

l. The combination of a work-circuit, a motor-operated rheostat in the same, a clutch between the motor and the movable contact of the rheostat, means operated by the workcircuit for storing energy, and means for restoring the rheostat to the v off position after a determinate amount of energy has been stored.

2. The combination 'of a work-circuit, a motoroperated rheostat in the same having a movable contact biased toward an off position, a clutch between the motor and the l l i movable contact, means operated by the workcircuit for storing energy, and means whereby the movable contact of the rheostat is released after a determinate amount of energy has been stored.

3. The combination otl a work-circuit, a motor-operated rheostat in the same having a movable contact biased to movement toward an ott position, an electromagnetic clutch between the motor and the movable contact, means operated by the work-circuit for storing energy, and means whereby said electromagnetic clutch is deenergized after a determinate amount of energy has been stored.

4. In a motor-operated pump the combination of a driving-motor for the pump, a motor-operated i'heostat, a clutch between the motor and the movable contact of the rheostat, and means governed by the pressure stored by the pump for opening the clutch and restoring the rheostat to its oi' position.

5. In a motor-operated pump, the combination ot' a driving-motor, an electrically-'operated rheostat having its movable contact biased toward an olf position, a clutch between the rheostat-motor and the contact, a cut-out for the rheostat-motor actuated at or near its full on position, means for closing the cut-out by return movement of the contact, and means determined by the pressure stored by the pump to open the clutch.

6. In a motor-operated pump, the combination ot' an electric pump-motor, an automatic rheostat in its circuit, a clutch between the rheostat-motor and the movable contact, a cutout for the rheostat-motor opened at or near its full on position, means for closing the same by a return movement of the contact, and an electrically-operated switch for opening and closing the pump-motor circuit at determinate pressures in the pump system.

7. A starting-rheostat for electric motors, comprising a resistance, amovable contact for cutting out said resistance, an electric motor for moving' said contact, an electromagnetic clutch for connecting said contact with the motor, an electromagnetic switch controlling the circuits through the resistance, motor and clutch, and a switch controlling the electromagnetic switch.

8. A starting-rheostat for electric motors, comprising a resistance, a movable contact for cutting out said resistance, an electric motor for moving said contact, an electromagnetic clutch for connecting said contact with the. motor, and means whereby said contact opencircuits the motor when all the resistance has been cut out.

IOO

9. A starting-rheostat for electric motors, l

comprising a resistance, a movable contact for cutting out said resistance, an electric motor ior moving said contact, an electromagnetic l clutch for connecting said contact with the motor, a spring for returning said contact to ofi position when the clutch is dener- IBO g'ized, a work-circuit including the rheostat, means for closing' the motor-circuit by the movement of the contact, and means controlled by the work circuit for clenerg'izing the clutch-magnet.

10. The combination with an electric motor, of a starting-rheostat in series therewith, means for automatically actuating' said rheostat to cut out the resistance when the motorcircuit is closed, means for automatically opening' the circuit of the actuating' means when all the resistance has been cut out, a workcircuit including' the rheostat and means for automatically cutting in said resistance, when the working circuit is broken.

ll. The combination with an electric motor, of a starting-rheostat in circuit therewith, an electric motor for actuating' the rheostat to FREDERICK MACKINTOSH.

VitneSSeS:

BENJAMIN B. HULL, FRED Russ. 

